package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@RequiredArgsConstructor
public class UserServiceImpl implements UserService {

    private final static String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    private final WeChatProperties weChatProperties;

    private final UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User weiLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获取当前微信用户的opendId
        String openid = getOpenId(userLoginDTO.getCode());
        // opendId判断
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);
        if(user == null){
            // 是新用户
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            // 创建用户
            userMapper.insert(user);
        }

        return user;
    }

    /**
     * 调用微信接口服务获取微信用户openId
     * @param code
     * @return
     */
    private String getOpenId(String code){
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String response = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(response);

        return jsonObject.getString("openid");
    }
}
